package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDate;
import java.time.LocalDateTime;

/**
 * 自定义切面 实现公共字段的自动填充的处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
        切入点
    */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)") //匹配拦截的方法
    public void autoFillPointCut() {
    }

    //前置通知 ,再通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始公共字段的填充");

        //获取当前被拦截的方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解
        OperationType operationType = autoFill.value();//获取数据的操作类型
        //获取拦截参数的数据参数
        Object[] args = joinPoint.getArgs(); //获取所有参数
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0]; //获取实体对象

        //准备赋值数据
        LocalDateTime now = LocalDateTime.now(); //当前时间
        Long currentId = BaseContext.getCurrentId();//  当前登录者的id

        //对不同的操作类型，为对应的属性通过反射赋值
        if (operationType == OperationType.INSERT) {
            //为四个规格字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射赋值
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                log.info("INSERT 反射赋值错误-> " + e);
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            //为两个规格字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                log.info("UPDATE 反射赋值错误-> " + e);
                throw new RuntimeException(e);
            }

        }


    }
}
